[net-next-2.6.git] / net / mac80211 / wpa.c

/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 * Copyright 2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <linux/ieee80211.h>
#include <asm/unaligned.h>
#include <net/mac80211.h>

#include "ieee80211_i.h"
#include "michael.h"
#include "tkip.h"
#include "aes_ccm.h"
#include "aes_cmac.h"
#include "wpa.h"

ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
	u8 *data, *key, *mic, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb = tx->skb;
	int authenticator;
	int wpa_test = 0;
	int tail;

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
	    !ieee80211_is_data_present(hdr->frame_control))
		return TX_CONTINUE;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen)
		return TX_DROP;

	data = skb->data + hdrlen;
	data_len = skb->len - hdrlen;

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
	    !wpa_test) {
		/* hwaccel - with no need for preallocated room for MMIC */
		return TX_CONTINUE;
	}

	tail = MICHAEL_MIC_LEN;
	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
		tail += TKIP_ICV_LEN;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < TKIP_IV_LEN))
		return TX_DROP;

#if 0
	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
#else
	authenticator = 1;
#endif
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	key = &tx->key->conf.key[key_offset];
	mic = skb_put(skb, MICHAEL_MIC_LEN);
	michael_mic(key, hdr, data, data_len, mic);

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
	u8 *data, *key = NULL, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	u8 mic[MICHAEL_MIC_LEN];
	struct sk_buff *skb = rx->skb;
	int authenticator = 1, wpa_test = 0;

	/* No way to verify the MIC if the hardware stripped it */
	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
		return RX_CONTINUE;

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
	    !ieee80211_has_protected(hdr->frame_control) ||
	    !ieee80211_is_data_present(hdr->frame_control))
		return RX_CONTINUE;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
		return RX_DROP_UNUSABLE;

	data = skb->data + hdrlen;
	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;

#if 0
	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
#else
	authenticator = 1;
#endif
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key = &rx->key->conf.key[key_offset];
	michael_mic(key, hdr, data, data_len, mic);
	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
		if (!(rx->flags & IEEE80211_RX_RA_MATCH))
			return RX_DROP_UNUSABLE;

		mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
						(void *) skb->data, NULL);
		return RX_DROP_UNUSABLE;
	}

	/* remove Michael MIC from payload */
	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);

	/* update IV in key information to be able to detect replays */
	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;

	return RX_CONTINUE;
}


static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	unsigned int hdrlen;
	int len, tail;
	u8 *pos;

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
		/* hwaccel - with no need for preallocated room for IV/ICV */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len = skb->len - hdrlen;

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
		tail = 0;
	else
		tail = TKIP_ICV_LEN;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < TKIP_IV_LEN))
		return -1;

	pos = skb_push(skb, TKIP_IV_LEN);
	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	pos += hdrlen;

	/* Increase IV for the frame */
	key->u.tkip.tx.iv16++;
	if (key->u.tkip.tx.iv16 == 0)
		key->u.tkip.tx.iv32++;

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
		/* hwaccel - with preallocated room for IV */
		ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);

		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	/* Add room for ICV */
	skb_put(skb, TKIP_ICV_LEN);

	hdr = (struct ieee80211_hdr *) skb->data;
	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
				    key, pos, len, hdr->addr2);
	return 0;
}


ieee80211_tx_result
ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	ieee80211_tx_set_protected(tx);

	do {
		if (tkip_encrypt_skb(tx, skb) < 0)
			return TX_DROP;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control))
		return RX_CONTINUE;

	if (!rx->sta || skb->len - hdrlen < 12)
		return RX_DROP_UNUSABLE;

	if (rx->status->flag & RX_FLAG_DECRYPTED) {
		if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
			/*
			 * Hardware took care of all processing, including
			 * replay protection, and stripped the ICV/IV so
			 * we cannot do any checks here.
			 */
			return RX_CONTINUE;
		}

		/* let TKIP code verify IV, but skip decryption */
		hwaccel = 1;
	}

	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
					  key, skb->data + hdrlen,
					  skb->len - hdrlen, rx->sta->sta.addr,
					  hdr->addr1, hwaccel, rx->queue,
					  &rx->tkip_iv32,
					  &rx->tkip_iv16);
	if (res != TKIP_DECRYPT_OK || wpa_test)
		return RX_DROP_UNUSABLE;

	/* Trim ICV */
	skb_trim(skb, skb->len - TKIP_ICV_LEN);

	/* Remove IV */
	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, TKIP_IV_LEN);

	return RX_CONTINUE;
}


static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
				int encrypted)
{
	__le16 mask_fc;
	int a4_included, mgmt;
	u8 qos_tid;
	u8 *b_0, *aad;
	u16 data_len, len_a;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	b_0 = scratch + 3 * AES_BLOCK_LEN;
	aad = scratch + 4 * AES_BLOCK_LEN;

	/*
	 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
	 * Retry, PwrMgt, MoreData; set Protected
	 */
	mgmt = ieee80211_is_mgmt(hdr->frame_control);
	mask_fc = hdr->frame_control;
	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
				IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
	if (!mgmt)
		mask_fc &= ~cpu_to_le16(0x0070);
	mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len_a = hdrlen - 2;
	a4_included = ieee80211_has_a4(hdr->frame_control);

	if (ieee80211_is_data_qos(hdr->frame_control))
		qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	else
		qos_tid = 0;

	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	if (encrypted)
		data_len -= CCMP_MIC_LEN;

	/* First block, b_0 */
	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	/* Nonce: Nonce Flags | A2 | PN
	 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
	 */
	b_0[1] = qos_tid | (mgmt << 4);
	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	/* l(m) */
	put_unaligned_be16(data_len, &b_0[14]);

	/* AAD (extra authenticate-only data) / masked 802.11 header
	 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
	put_unaligned_be16(len_a, &aad[0]);
	put_unaligned(mask_fc, (__le16 *)&aad[2]);
	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);

	/* Mask Seq#, leave Frag# */
	aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
	aad[23] = 0;

	if (a4_included) {
		memcpy(&aad[24], hdr->addr4, ETH_ALEN);
		aad[30] = qos_tid;
		aad[31] = 0;
	} else {
		memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
		aad[24] = qos_tid;
	}
}


static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
{
	hdr[0] = pn[5];
	hdr[1] = pn[4];
	hdr[2] = 0;
	hdr[3] = 0x20 | (key_id << 6);
	hdr[4] = pn[3];
	hdr[5] = pn[2];
	hdr[6] = pn[1];
	hdr[7] = pn[0];
}


static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
{
	pn[0] = hdr[7];
	pn[1] = hdr[6];
	pn[2] = hdr[5];
	pn[3] = hdr[4];
	pn[4] = hdr[1];
	pn[5] = hdr[0];
}


static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int hdrlen, len, tail;
	u8 *pos, *pn;
	int i;
	bool skip_hw;

	skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
		ieee80211_is_mgmt(hdr->frame_control);

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
	    !skip_hw) {
		/* hwaccel - with no need for preallocated room for CCMP
		 * header or MIC fields */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len = skb->len - hdrlen;

	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
		tail = 0;
	else
		tail = CCMP_MIC_LEN;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < CCMP_HDR_LEN))
		return -1;

	pos = skb_push(skb, CCMP_HDR_LEN);
	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	hdr = (struct ieee80211_hdr *) pos;
	pos += hdrlen;

	/* PN = PN + 1 */
	pn = key->u.ccmp.tx_pn;

	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
		pn[i]++;
		if (pn[i])
			break;
	}

	ccmp_pn2hdr(pos, pn, key->conf.keyidx);

	if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
		/* hwaccel - with preallocated room for CCMP header */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	pos += CCMP_HDR_LEN;
	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
				  pos, skb_put(skb, CCMP_MIC_LEN));

	return 0;
}


ieee80211_tx_result
ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	ieee80211_tx_set_protected(tx);

	do {
		if (ccmp_encrypt_skb(tx, skb) < 0)
			return TX_DROP;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	int hdrlen;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	u8 pn[CCMP_PN_LEN];
	int data_len;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control) &&
	    !ieee80211_is_robust_mgmt_frame(hdr))
		return RX_CONTINUE;

	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	if (!rx->sta || data_len < 0)
		return RX_DROP_UNUSABLE;

	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
	    (rx->status->flag & RX_FLAG_IV_STRIPPED))
		return RX_CONTINUE;

	ccmp_hdr2pn(pn, skb->data + hdrlen);

	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
		key->u.ccmp.replays++;
		return RX_DROP_UNUSABLE;
	}

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		/* hardware didn't decrypt/verify MIC */
		ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);

		if (ieee80211_aes_ccm_decrypt(
			    key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
			    skb->data + hdrlen + CCMP_HDR_LEN, data_len,
			    skb->data + skb->len - CCMP_MIC_LEN,
			    skb->data + hdrlen + CCMP_HDR_LEN))
			return RX_DROP_UNUSABLE;
	}

	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);

	/* Remove CCMP header and MIC */
	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	skb_pull(skb, CCMP_HDR_LEN);

	return RX_CONTINUE;
}


static void bip_aad(struct sk_buff *skb, u8 *aad)
{
	/* BIP AAD: FC(masked) || A1 || A2 || A3 */

	/* FC type/subtype */
	aad[0] = skb->data[0];
	/* Mask FC Retry, PwrMgt, MoreData flags to zero */
	aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6));
	/* A1 || A2 || A3 */
	memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
}


static inline void bip_ipn_swap(u8 *d, const u8 *s)
{
	*d++ = s[5];
	*d++ = s[4];
	*d++ = s[3];
	*d++ = s[2];
	*d++ = s[1];
	*d = s[0];
}


ieee80211_tx_result
ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_key *key = tx->key;
	struct ieee80211_mmie *mmie;
	u8 *pn, aad[20];
	int i;

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
		/* hwaccel */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
		return TX_DROP;

	mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
	mmie->element_id = WLAN_EID_MMIE;
	mmie->length = sizeof(*mmie) - 2;
	mmie->key_id = cpu_to_le16(key->conf.keyidx);

	/* PN = PN + 1 */
	pn = key->u.aes_cmac.tx_pn;

	for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
		pn[i]++;
		if (pn[i])
			break;
	}
	bip_ipn_swap(mmie->sequence_number, pn);

	bip_aad(skb, aad);

	/*
	 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
	 */
	ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
			   aad, skb->data + 24, skb->len - 24, mmie->mic);

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_key *key = rx->key;
	struct ieee80211_mmie *mmie;
	u8 aad[20], mic[8], ipn[6];
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (!ieee80211_is_mgmt(hdr->frame_control))
		return RX_CONTINUE;

	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
	    (rx->status->flag & RX_FLAG_IV_STRIPPED))
		return RX_CONTINUE;

	if (skb->len < 24 + sizeof(*mmie))
		return RX_DROP_UNUSABLE;

	mmie = (struct ieee80211_mmie *)
		(skb->data + skb->len - sizeof(*mmie));
	if (mmie->element_id != WLAN_EID_MMIE ||
	    mmie->length != sizeof(*mmie) - 2)
		return RX_DROP_UNUSABLE; /* Invalid MMIE */

	bip_ipn_swap(ipn, mmie->sequence_number);

	if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
		key->u.aes_cmac.replays++;
		return RX_DROP_UNUSABLE;
	}

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		/* hardware didn't decrypt/verify MIC */
		bip_aad(skb, aad);
		ieee80211_aes_cmac(key->u.aes_cmac.tfm,
				   key->u.aes_cmac.rx_crypto_buf, aad,
				   skb->data + 24, skb->len - 24, mic);
		if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
			key->u.aes_cmac.icverrors++;
			return RX_DROP_UNUSABLE;
		}
	}

	memcpy(key->u.aes_cmac.rx_pn, ipn, 6);

	/* Remove MMIE */
	skb_trim(skb, skb->len - sizeof(*mmie));

	return RX_CONTINUE;
}
Commit	Line	Data
f0706e82 JB	1	/*
f0706e82 JB	2	* Copyright 2002-2004, Instant802 Networks, Inc.
765cb46a	3	* Copyright 2008, Jouni Malinen <j@w1.fi>
f0706e82 JB	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/netdevice.h>
	11	#include <linux/types.h>
	12	#include <linux/slab.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/compiler.h>
f14df804 HH	15	#include <linux/ieee80211.h>
f14df804 HH	16	#include <asm/unaligned.h>
f0706e82	17	#include <net/mac80211.h>
eb063c17	18
f0706e82 JB	19	#include "ieee80211_i.h"
	20	#include "michael.h"
	21	#include "tkip.h"
	22	#include "aes_ccm.h"
765cb46a	23	#include "aes_cmac.h"
f0706e82 JB	24	#include "wpa.h"
f0706e82 JB	25
9ae54c84	26	ieee80211_tx_result
5cf121c3	27	ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82	28	{
8e8862b7	29	u8 data, key, *mic, key_offset;
f0706e82	30	size_t data_len;
8e8862b7 HH	31	unsigned int hdrlen;
8e8862b7 HH	32	struct ieee80211_hdr *hdr;
f0706e82 JB	33	struct sk_buff *skb = tx->skb;
	34	int authenticator;
	35	int wpa_test = 0;
23c0752a	36	int tail;
f0706e82	37
c34498b9	38	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	39	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
c34498b9	40	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	41	return TX_CONTINUE;
f0706e82	42
8e8862b7 HH	43	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	44	if (skb->len < hdrlen)
9ae54c84	45	return TX_DROP;
f0706e82	46
8e8862b7 HH	47	data = skb->data + hdrlen;
	48	data_len = skb->len - hdrlen;
	49
11a843b7	50	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
5cf121c3	51	!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
7848ba7d	52	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82	53	!wpa_test) {
c6a1fa12	54	/* hwaccel - with no need for preallocated room for MMIC */
9ae54c84	55	return TX_CONTINUE;
f0706e82 JB	56	}
f0706e82 JB	57
23c0752a JB	58	tail = MICHAEL_MIC_LEN;
	59	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	60	tail += TKIP_ICV_LEN;
	61
	62	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	63	skb_headroom(skb) < TKIP_IV_LEN))
	64	return TX_DROP;
f0706e82 JB	65
	66	#if 0
	67	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	68	#else
	69	authenticator = 1;
	70	#endif
ffd7891d LR	71	key_offset = authenticator ?
	72	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
	73	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	74	key = &tx->key->conf.key[key_offset];
f0706e82	75	mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7	76	michael_mic(key, hdr, data, data_len, mic);
f0706e82	77
9ae54c84	78	return TX_CONTINUE;
f0706e82 JB	79	}
	80
	81
9ae54c84	82	ieee80211_rx_result
5cf121c3	83	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82	84	{
8e8862b7	85	u8 data, key = NULL, key_offset;
f0706e82	86	size_t data_len;
8e8862b7 HH	87	unsigned int hdrlen;
8e8862b7 HH	88	struct ieee80211_hdr *hdr;
f0706e82 JB	89	u8 mic[MICHAEL_MIC_LEN];
	90	struct sk_buff *skb = rx->skb;
	91	int authenticator = 1, wpa_test = 0;
	92
c6a1fa12	93	/* No way to verify the MIC if the hardware stripped it */
5cf121c3	94	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	95	return RX_CONTINUE;
f0706e82	96
c34498b9	97	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	98	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
c34498b9 HH	99	!ieee80211_has_protected(hdr->frame_control) \|\|
c34498b9 HH	100	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	101	return RX_CONTINUE;
f0706e82	102
8e8862b7 HH	103	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	104	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add	105	return RX_DROP_UNUSABLE;
f0706e82	106
8e8862b7 HH	107	data = skb->data + hdrlen;
8e8862b7 HH	108	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
f0706e82 JB	109
	110	#if 0
	111	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	112	#else
	113	authenticator = 1;
	114	#endif
ffd7891d LR	115	key_offset = authenticator ?
	116	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
	117	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	118	key = &rx->key->conf.key[key_offset];
8e8862b7	119	michael_mic(key, hdr, data, data_len, mic);
f0706e82	120	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	121	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	122	return RX_DROP_UNUSABLE;
f0706e82	123
f698d856	124	mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
a3b8b056	125	(void *) skb->data, NULL);
e4c26add	126	return RX_DROP_UNUSABLE;
f0706e82 JB	127	}
f0706e82 JB	128
f0706e82 JB	129	/* remove Michael MIC from payload */
	130	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	131
50741ae0	132	/* update IV in key information to be able to detect replays */
b0f76b33 HH	133	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	134	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	135
9ae54c84	136	return RX_CONTINUE;
f0706e82 JB	137	}
	138
	139
e039fa4a	140	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	141	{
	142	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	143	struct ieee80211_key *key = tx->key;
e039fa4a	144	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	145	unsigned int hdrlen;
d5184cac HH	146	int len, tail;
f0706e82 JB	147	u8 *pos;
f0706e82 JB	148
e039fa4a JB	149	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	150	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	151	/* hwaccel - with no need for preallocated room for IV/ICV */
	152	info->control.hw_key = &tx->key->conf;
23c0752a	153	return 0;
e039fa4a JB	154	}
e039fa4a JB	155
d5184cac	156	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	157	len = skb->len - hdrlen;
f0706e82 JB	158
11a843b7	159	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	160	tail = 0;
11a843b7	161	else
23c0752a JB	162	tail = TKIP_ICV_LEN;
	163
	164	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	165	skb_headroom(skb) < TKIP_IV_LEN))
	166	return -1;
f0706e82 JB	167
	168	pos = skb_push(skb, TKIP_IV_LEN);
	169	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	170	pos += hdrlen;
	171
	172	/* Increase IV for the frame */
b0f76b33 HH	173	key->u.tkip.tx.iv16++;
	174	if (key->u.tkip.tx.iv16 == 0)
	175	key->u.tkip.tx.iv32++;
f0706e82	176
11a843b7	177	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	178	/* hwaccel - with preallocated room for IV */
c801242c	179	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	180
e039fa4a	181	info->control.hw_key = &tx->key->conf;
f0706e82 JB	182	return 0;
	183	}
	184
	185	/* Add room for ICV */
	186	skb_put(skb, TKIP_ICV_LEN);
	187
	188	hdr = (struct ieee80211_hdr *) skb->data;
	189	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	190	key, pos, len, hdr->addr2);
	191	return 0;
	192	}
	193
	194
9ae54c84	195	ieee80211_tx_result
5cf121c3	196	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	197	{
f0706e82	198	struct sk_buff *skb = tx->skb;
f0706e82	199
5cf121c3	200	ieee80211_tx_set_protected(tx);
f0706e82	201
2de8e0d9 JB	202	do {
	203	if (tkip_encrypt_skb(tx, skb) < 0)
	204	return TX_DROP;
	205	} while ((skb = skb->next));
f0706e82	206
9ae54c84	207	return TX_CONTINUE;
f0706e82 JB	208	}
	209
	210
9ae54c84	211	ieee80211_rx_result
5cf121c3	212	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	213	{
f0706e82 JB	214	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	215	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	216	struct ieee80211_key *key = rx->key;
	217	struct sk_buff *skb = rx->skb;
	218
d5184cac	219	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	220
c34498b9	221	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	222	return RX_CONTINUE;
f0706e82 JB	223
f0706e82 JB	224	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	225	return RX_DROP_UNUSABLE;
f0706e82	226
5cf121c3 JB	227	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	228	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	229	/*
	230	* Hardware took care of all processing, including
	231	* replay protection, and stripped the ICV/IV so
	232	* we cannot do any checks here.
	233	*/
9ae54c84	234	return RX_CONTINUE;
f0706e82 JB	235	}
	236
	237	/* let TKIP code verify IV, but skip decryption */
	238	hwaccel = 1;
	239	}
	240
	241	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	242	key, skb->data + hdrlen,
17741cdc	243	skb->len - hdrlen, rx->sta->sta.addr,
9ae4fda3	244	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	245	&rx->tkip_iv32,
5cf121c3 JB	246	&rx->tkip_iv16);
f4ea83dd	247	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	248	return RX_DROP_UNUSABLE;
f0706e82 JB	249
	250	/* Trim ICV */
	251	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	252
	253	/* Remove IV */
	254	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	255	skb_pull(skb, TKIP_IV_LEN);
	256
9ae54c84	257	return RX_CONTINUE;
f0706e82 JB	258	}
	259
	260
feccb466	261	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 *scratch,
f0706e82 JB	262	int encrypted)
f0706e82 JB	263	{
f14df804	264	__le16 mask_fc;
fb733336	265	int a4_included, mgmt;
f14df804	266	u8 qos_tid;
feccb466	267	u8 b_0, aad;
f14df804 HH	268	u16 data_len, len_a;
	269	unsigned int hdrlen;
	270	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	271
feccb466 HH	272	b_0 = scratch + 3 * AES_BLOCK_LEN;
	273	aad = scratch + 4 * AES_BLOCK_LEN;
	274
f14df804	275	/*
fb733336	276	* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
f14df804 HH	277	* Retry, PwrMgt, MoreData; set Protected
f14df804 HH	278	*/
fb733336	279	mgmt = ieee80211_is_mgmt(hdr->frame_control);
f14df804	280	mask_fc = hdr->frame_control;
fb733336	281	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY \|
f14df804	282	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
fb733336 JM	283	if (!mgmt)
fb733336 JM	284	mask_fc &= ~cpu_to_le16(0x0070);
f14df804 HH	285	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	286
	287	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	288	len_a = hdrlen - 2;
	289	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	290
f14df804 HH	291	if (ieee80211_is_data_qos(hdr->frame_control))
	292	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	293	else
	294	qos_tid = 0;
	295
	296	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	297	if (encrypted)
	298	data_len -= CCMP_MIC_LEN;
	299
	300	/* First block, b_0 */
f0706e82	301	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
fb733336 JM	302	/* Nonce: Nonce Flags \| A2 \| PN
	303	* Nonce Flags: Priority (b0..b3) \| Management (b4) \| Reserved (b5..b7)
	304	*/
	305	b_0[1] = qos_tid \| (mgmt << 4);
73e1f7c8	306	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	307	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	308	/* l(m) */
f14df804	309	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	310
	311	/* AAD (extra authenticate-only data) / masked 802.11 header
	312	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	313	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	314	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	315	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	316
	317	/* Mask Seq#, leave Frag# */
	318	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	319	aad[23] = 0;
f14df804	320
f0706e82	321	if (a4_included) {
73e1f7c8	322	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	323	aad[30] = qos_tid;
f0706e82	324	aad[31] = 0;
f14df804	325	} else {
73e1f7c8	326	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	327	aad[24] = qos_tid;
f0706e82 JB	328	}
	329	}
	330
	331
	332	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	333	{
	334	hdr[0] = pn[5];
	335	hdr[1] = pn[4];
	336	hdr[2] = 0;
	337	hdr[3] = 0x20 \| (key_id << 6);
	338	hdr[4] = pn[3];
	339	hdr[5] = pn[2];
	340	hdr[6] = pn[1];
	341	hdr[7] = pn[0];
	342	}
	343
	344
c6a1fa12	345	static inline void ccmp_hdr2pn(u8 pn, u8 hdr)
f0706e82 JB	346	{
	347	pn[0] = hdr[7];
	348	pn[1] = hdr[6];
	349	pn[2] = hdr[5];
	350	pn[3] = hdr[4];
	351	pn[4] = hdr[1];
	352	pn[5] = hdr[0];
f0706e82 JB	353	}
	354
	355
e039fa4a	356	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	357	{
	358	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	359	struct ieee80211_key *key = tx->key;
e039fa4a	360	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	361	int hdrlen, len, tail;
feccb466	362	u8 pos, pn;
f0706e82	363	int i;
1f7d77ab JM	364	bool skip_hw;
	365
	366	skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
	367	ieee80211_is_mgmt(hdr->frame_control);
f0706e82	368
e039fa4a	369	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
1f7d77ab JM	370	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
1f7d77ab JM	371	!skip_hw) {
c6a1fa12	372	/* hwaccel - with no need for preallocated room for CCMP
e039fa4a JB	373	* header or MIC fields */
e039fa4a JB	374	info->control.hw_key = &tx->key->conf;
23c0752a	375	return 0;
e039fa4a JB	376	}
e039fa4a JB	377
d5184cac	378	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	379	len = skb->len - hdrlen;
f0706e82 JB	380
11a843b7	381	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	382	tail = 0;
11a843b7	383	else
23c0752a JB	384	tail = CCMP_MIC_LEN;
	385
	386	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	387	skb_headroom(skb) < CCMP_HDR_LEN))
	388	return -1;
f0706e82 JB	389
	390	pos = skb_push(skb, CCMP_HDR_LEN);
	391	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	392	hdr = (struct ieee80211_hdr *) pos;
	393	pos += hdrlen;
	394
	395	/* PN = PN + 1 */
	396	pn = key->u.ccmp.tx_pn;
	397
	398	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	399	pn[i]++;
	400	if (pn[i])
	401	break;
	402	}
	403
8f20fc24	404	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	405
1f7d77ab	406	if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
f0706e82	407	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	408	info->control.hw_key = &tx->key->conf;
f0706e82 JB	409	return 0;
	410	}
	411
	412	pos += CCMP_HDR_LEN;
feccb466 HH	413	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
feccb466 HH	414	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
f0706e82 JB	415	pos, skb_put(skb, CCMP_MIC_LEN));
	416
	417	return 0;
	418	}
	419
	420
9ae54c84	421	ieee80211_tx_result
5cf121c3	422	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	423	{
f0706e82	424	struct sk_buff *skb = tx->skb;
f0706e82	425
5cf121c3	426	ieee80211_tx_set_protected(tx);
f0706e82	427
2de8e0d9 JB	428	do {
	429	if (ccmp_encrypt_skb(tx, skb) < 0)
	430	return TX_DROP;
	431	} while ((skb = skb->next));
f0706e82	432
9ae54c84	433	return TX_CONTINUE;
f0706e82 JB	434	}
	435
	436
9ae54c84	437	ieee80211_rx_result
5cf121c3	438	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82	439	{
c34498b9	440	struct ieee80211_hdr hdr = (struct ieee80211_hdr )rx->skb->data;
f0706e82 JB	441	int hdrlen;
	442	struct ieee80211_key *key = rx->key;
	443	struct sk_buff *skb = rx->skb;
	444	u8 pn[CCMP_PN_LEN];
	445	int data_len;
	446
d5184cac	447	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	448
fb733336 JM	449	if (!ieee80211_is_data(hdr->frame_control) &&
fb733336 JM	450	!ieee80211_is_robust_mgmt_frame(hdr))
9ae54c84	451	return RX_CONTINUE;
f0706e82 JB	452
	453	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	454	if (!rx->sta \|\| data_len < 0)
e4c26add	455	return RX_DROP_UNUSABLE;
f0706e82	456
5cf121c3 JB	457	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	458	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	459	return RX_CONTINUE;
f0706e82	460
c6a1fa12	461	ccmp_hdr2pn(pn, skb->data + hdrlen);
f0706e82	462
5cf121c3	463	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	464	key->u.ccmp.replays++;
e4c26add	465	return RX_DROP_UNUSABLE;
f0706e82 JB	466	}
f0706e82 JB	467
5cf121c3	468	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	469	/* hardware didn't decrypt/verify MIC */
feccb466	470	ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
f0706e82 JB	471
f0706e82 JB	472	if (ieee80211_aes_ccm_decrypt(
feccb466	473	key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
f0706e82 JB	474	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
f0706e82 JB	475	skb->data + skb->len - CCMP_MIC_LEN,
c6a1fa12	476	skb->data + hdrlen + CCMP_HDR_LEN))
e4c26add	477	return RX_DROP_UNUSABLE;
f0706e82 JB	478	}
f0706e82 JB	479
5cf121c3	480	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	481
	482	/* Remove CCMP header and MIC */
	483	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	484	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	485	skb_pull(skb, CCMP_HDR_LEN);
	486
9ae54c84	487	return RX_CONTINUE;
f0706e82	488	}
765cb46a JM	489
	490
	491	static void bip_aad(struct sk_buff skb, u8 aad)
	492	{
	493	/* BIP AAD: FC(masked) \|\| A1 \|\| A2 \|\| A3 */
	494
	495	/* FC type/subtype */
	496	aad[0] = skb->data[0];
	497	/* Mask FC Retry, PwrMgt, MoreData flags to zero */
	498	aad[1] = skb->data[1] & ~(BIT(4) \| BIT(5) \| BIT(6));
	499	/* A1 \|\| A2 \|\| A3 */
	500	memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
	501	}
	502
	503
	504	static inline void bip_ipn_swap(u8 d, const u8 s)
	505	{
	506	*d++ = s[5];
	507	*d++ = s[4];
	508	*d++ = s[3];
	509	*d++ = s[2];
	510	*d++ = s[1];
	511	*d = s[0];
	512	}
	513
	514
	515	ieee80211_tx_result
	516	ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
	517	{
	518	struct sk_buff *skb = tx->skb;
	519	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	520	struct ieee80211_key *key = tx->key;
	521	struct ieee80211_mmie *mmie;
	522	u8 *pn, aad[20];
	523	int i;
	524
	525	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
	526	/* hwaccel */
	527	info->control.hw_key = &tx->key->conf;
	528	return 0;
	529	}
	530
	531	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
	532	return TX_DROP;
	533
	534	mmie = (struct ieee80211_mmie ) skb_put(skb, sizeof(mmie));
	535	mmie->element_id = WLAN_EID_MMIE;
	536	mmie->length = sizeof(*mmie) - 2;
	537	mmie->key_id = cpu_to_le16(key->conf.keyidx);
	538
	539	/* PN = PN + 1 */
	540	pn = key->u.aes_cmac.tx_pn;
	541
	542	for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
	543	pn[i]++;
	544	if (pn[i])
	545	break;
	546	}
	547	bip_ipn_swap(mmie->sequence_number, pn);
	548
	549	bip_aad(skb, aad);
	550
	551	/*
	552	* MIC = AES-128-CMAC(IGTK, AAD \|\| Management Frame Body \|\| MMIE, 64)
553	*/
554	ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
555	aad, skb->data + 24, skb->len - 24, mmie->mic);
556
557	return TX_CONTINUE;
558	}
559
560
561	ieee80211_rx_result
562	ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
563	{
564	struct sk_buff *skb = rx->skb;
565	struct ieee80211_key *key = rx->key;
566	struct ieee80211_mmie *mmie;
567	u8 aad[20], mic[8], ipn[6];
568	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
569
570	if (!ieee80211_is_mgmt(hdr->frame_control))
571	return RX_CONTINUE;
572
573	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
574	(rx->status->flag & RX_FLAG_IV_STRIPPED))
575	return RX_CONTINUE;
576
577	if (skb->len < 24 + sizeof(*mmie))
578	return RX_DROP_UNUSABLE;
579
580	mmie = (struct ieee80211_mmie *)
581	(skb->data + skb->len - sizeof(*mmie));
582	if (mmie->element_id != WLAN_EID_MMIE \|\|
583	mmie->length != sizeof(*mmie) - 2)
584	return RX_DROP_UNUSABLE; /* Invalid MMIE */
585
586	bip_ipn_swap(ipn, mmie->sequence_number);
587
588	if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
589	key->u.aes_cmac.replays++;
590	return RX_DROP_UNUSABLE;
591	}
592
593	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
594	/* hardware didn't decrypt/verify MIC */
595	bip_aad(skb, aad);
596	ieee80211_aes_cmac(key->u.aes_cmac.tfm,
597	key->u.aes_cmac.rx_crypto_buf, aad,
598	skb->data + 24, skb->len - 24, mic);
599	if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
600	key->u.aes_cmac.icverrors++;
601	return RX_DROP_UNUSABLE;
602	}
603	}
604
605	memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
606
607	/* Remove MMIE */
608	skb_trim(skb, skb->len - sizeof(*mmie));
609
610	return RX_CONTINUE;
611	}